package com.puff.framework.utils;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import com.puff.framework.Charsets;

public final class Security {

	/**
	 * Used building output as Hex
	 */
	private static final char[] DIGITS = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };

	/**
	 * 对字符串进行MD5加密
	 * 
	 * @param text
	 *            明文
	 * 
	 * @return 密文
	 */
	public static String md5(String text) {
		MessageDigest msgDigest = null;

		try {
			msgDigest = MessageDigest.getInstance("MD5");
		} catch (NoSuchAlgorithmException e) {
			throw new IllegalStateException("System doesn't support MD5 algorithm.");
		}
		msgDigest.update(text.getBytes(Charsets.UTF_8));
		byte[] bytes = msgDigest.digest();
		String md5Str = new String(encodeHex(bytes));
		return md5Str.toUpperCase();
	}

	public static char[] encodeHex(byte[] data) {

		int l = data.length;

		char[] out = new char[l << 1];

		// two characters form the hex value.
		for (int i = 0, j = 0; i < l; i++) {
			out[j++] = DIGITS[(0xF0 & data[i]) >>> 4];
			out[j++] = DIGITS[0x0F & data[i]];
		}

		return out;
	}

	/**
	 * blowfish加密
	 * 
	 * @param data
	 * @return
	 */
	public static String blowFish(String data) {
		return new BlowFish().encrypt(data);
	}

	/**
	 * AES加密
	 * 
	 * @param data
	 * @return
	 */
	public static String aesEncrypt(String data) {
		return AESUtil.encrypt(data);
	}

	/**
	 * AES解密
	 * 
	 * @param data
	 * @return
	 */
	public static String aesDecrypt(String data) {
		return AESUtil.decrypt(data);
	}

	public static void main(String[] args) {
		System.out.println(md5("111111"));
	}

}
